One vertex per element, one color per generator, with an edge from x to x·s.
(2,3)(4,8)(10,12)(14,15)(17,18)(19,21)(20,22)(23,24)(25,26,30,28)(27,33,35,31)(29,32,37,36)(34,39,40,38)(1,2,5,3)(4,7,8,6)(10,12)(14,15)(18,19)(22,23)(29,37)(32,36)(34,40)(38,39)(4,8)(6,7)(9,10,13,12)(11,15,16,14)(17,19,21,18)(20,22,24,23)(25,27,30,35)(26,31,28,33)(29,34,37,40)(32,38,36,39)(1,3,5,2)(4,7,8,6)(9,11,13,16)(10,14,12,15)(17,20)(18,22)(19,23)(21,24)(25,28,30,26)(27,31,35,33)(29,36,37,32)(34,38,40,39)(1,4,5,8)(2,6,3,7)(9,12,13,10)(11,15,16,14)(17,20)(18,22)(19,23)(21,24)(25,29)(26,32)(27,34)(28,36)(30,37)(31,38)(33,39)(35,40)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.